// 报警值及阈值来自事件快照，不使用设备当前阈值重算历史事件。
const present = value => value !== null && value !== undefined && value !== ''
export const hasActualValue = row => present(row?.actualValue)
export const valueText = (value, unit = '') => present(value) ? `${value}${unit ? ` ${unit}` : ''}` : '—'
export function thresholdText(row = {}) {
  const unit = row.warningUnit || ''
  if (present(row.minValue) && present(row.maxValue)) return `${row.minValue} ～ ${valueText(row.maxValue, unit)}`
  if (present(row.minValue)) return `下限 ${valueText(row.minValue, unit)}`
  if (present(row.maxValue)) return `上限 ${valueText(row.maxValue, unit)}`
  return '—'
}
// 报警内容由后端生成，页面不再按指标名称或阈值重新拼接。
export function alarmDescription(row = {}) {
  return present(row.alarmContent) ? row.alarmContent : ''
}
export function imageAttachments(value, baseUrl = '') {
  return String(value || '').split(',').map(path => path.trim()).filter(Boolean).flatMap(path => {
    // 历史附件也只允许 HTTP(S) 或站内资源，拒绝脚本 URL 和协议相对路径。
    if (!/^https?:\/\//i.test(path) && !/^\/(?!\/)/.test(path)) return []
    const pathname = path.split(/[?#]/)[0]
    if (!/\.(jpe?g|png|gif|webp|bmp|avif)$/i.test(pathname)) return []
    const url = path.startsWith('/') ? `${baseUrl}${path}` : path
    const name = pathname.split('/').pop() || '图片'
    return [{ url, name }]
  })
}